. Principles and practice of plumbing . sed to keep from enteringthe main sewers the gasoline drip-pings from motor cars, and the oilsused in cleaning and explosions, tearing upthe street for miles, and doing mil-lions of dollars worth of damage Fig. 21have been caused by the ignition ^a^ ^ ^^^^ Drainof an explosive mixture of gasoline vapor and air. Illum-inating gas is another source of danger when it escapesfrom the gas mains and enters the street sewers. Oil separators should be installed in public and otherlarge garages, to trap out the oil and gasoline. They arenot
. Principles and practice of plumbing . sed to keep from enteringthe main sewers the gasoline drip-pings from motor cars, and the oilsused in cleaning and explosions, tearing upthe street for miles, and doing mil-lions of dollars worth of damage Fig. 21have been caused by the ignition ^a^ ^ ^^^^ Drainof an explosive mixture of gasoline vapor and air. Illum-inating gas is another source of danger when it escapesfrom the gas mains and enters the street sewers. Oil separators should be installed in public and otherlarge garages, to trap out the oil and gasoline. They arenothing more or less than large grease traps, which areconnected to a system of piping independent of the mainsystem. They have their own main-drain trap and fresh-air inlet; a 2-inch vent pipe from tank to roof; a system ofpiping which takes the waste from all floor drains andcarriage washes where oils and gasoline are used; and amain vent stack of the full size of the oil system drain,extending through the roof. Digitized by Microsoft®. Principles and Practice of Plumbing 47 CHAPTER VISIPHONS AND SIPHONAGE Description of Siphon and Siphonage.—There is noapparatus or no force having so many uses and functionsin plumbing practice as the siphon. Most of the apparatusused in plumbing are operated by means of siphons; onthe other hand, siphonage causes more trouble than any-thing else. It is siphonage which destroys the seals oftraps when not properly ventilated, and the same invisibleforce which causes range boilers to collapse. A siphon can be seen in Fig. 22, which shows one of thesimplest forms. It is nothing more or less than a bent tubeor pipe, made in the form of a letter U, but having legs ofunequal length. That is the prime characteristic of asiphon of any kind, to have legs of unequal length, for ifboth legs were of the same length it would not be a siphon,and would not operate as one. The operation of the siphon is simple. If the short legof the empty tube were immersed
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